[Webkit-unassigned] [Bug 217183] [iOS 14] Hang in -[WKUserDefaults _notifyObserversOfChangeFromValuesForKeys:toValuesForKeys:]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217183

--- Comment #18 from Darin Adler <darin at apple.com> ---
(In reply to Per Arne Vollan from comment #17)
> This is to avoid extra thread hopping if the method is already being called
> on a non-main thread.

But *why* is avoiding extra thread hopping a good thing? Is there some reason that non-main threads are always OK to block?

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